Chemistry Crossword

2. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
5. substance that helps a chemical reaction to proceed more quickly
8. the smallest part of an element that is representative of that element
10. combination of symbols that represent a compound
12. group 1 element in the periodic table, not including hydrogen, the most reactive of the metals
14. a solution in which water is the solvent
16. invisible negatively charged particle that orbits around the nucleus of the atom
18. chemical reaction that takes place in cells
19. anything that has mass and takes up space
20. positively charged center of an atom; contains protons and neutrons
22. description of a substance that can be pounded or rolled into sheets
23. change in state from a solid to a gas
24. positively charged particle in the nucleus of an atom
25. change of state from a solid to a liquid

1. a table in which elements are organized by their physical and chemical properties
3. pure substance formed when at least one metal and non-metal combine
4. mass of one atom of an element calculated from the total number of protons, electrons and neutrons of that atom
6. number of protons in the nucleus of one atom of an element
7. group 2 elements of the periodic table, their reactivity is not as strong as the alkali metals
9. pure substance that cannot be broken down into other substances
11. description of how a substance interacts with another substance
13. measure of atomic mass
15. change that results when 2 or more substances react to create a new substance
17. vertical column of elements in the periodic table
21. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy